Hi all.
I've just made my first attempt at overclocking my PC. I'm being very cautiuos about it as I can't afford a new system at the moment.
System: Pentium 200 MMX
First thing I did was to change the Bus Speed from 66MHx to 75Mhz, Then booted into BIOS to check temps. So far so good. Next I tried to boot into Windows98se, but the system just hangs. Any suggestions?

Adjust your ram timings, if no luck it could be your PSU or really just about anything. Best thing to do is to clear cmos and just run it at 200mhz...

Hey, well, I ran my pentium 200mmx at 225 (75 bus) fine. I did however get a heatsink with a fan on it to replace the passive heatsink it came with.

ummm dunno man, like john says, could be anything...

i know its anoying checking your system temperatures in bios, i know of a good program to check them in windows (you can even put them in the system tray) just search google for "download speedfan" and youll be able to find it. it should work :)

but how much can you OC a 200MMX before it frys? i meaa, say 300MHz, that's like what....20% performance increase? at the expense of overheating and possibly frying some circuits? listen, I too, have a 200MMX in one of my computers, I spent $200 and bought an Evergreen Techonologies AcceleraPCI 533MHz/128, it's a celeron 533MHZ (with expansion to +1GHz), and 128MB of SODIMM(also upgradeable), all you do is, plug it in your PCI slot, done, instant performance increase, www.evertech.com

I have a 200mmx also and have tried it to 225 and always get registry error when win98 hangs. i'm told that win98 is not very compatable to overclocking. so far, nothing works. would like to know if anyone else has had registry errors like this. you might try unplugging all non essentual pci devices and in cmos, turning off all shadowing and caching of ram and vidio bios; sdram set to lowest possible numbers; 8 and 16 bit i/o recovery speeds to 4 and 8 respectively.

LAUGHIN MY ASS OFF here.

Well, I may hold the record here, let me know if not, but I over clocked a p2 266 MMX up to around 450 mhz (can't remember exact number).

I used a fridge coller peltier fan with an aluminium BLOCK about 4 inches long and 2 inches thick, and two medium size fans. It was NOISY!!! I just upped the mulitplier!

And what happened? Well it ran for months, with no problems. BUT I decided to have a look inside the thing and found WATER where the condensation reaction had created a thimbleful of water inside the sealed part and it had leaked through the sealing paste. All the copper stuff had gone green.

But it worked for months before that, and I upgraded.

Check out fridge coolers for overclocking. They are SO COOL! Word of warning though. Don't polug it in without connecting it first, one side gets sub zero in temperature within seconds, the other side gets "surface of the sun" hot, hence need for stupid size heatsink and Boeing powered fans!

I was able to get a celeronA 300 to go to
450 with nothing but haveing two fans on
the heatsink.

a p-200mmx can run all the way to 275
but it will crash at that speed. I suggest
around 225-250.

LONG LIVE LINUX!!!

I wonder if all of these fantastic claims about over clocking a cpu 2 or 3 times it's rated value can even run windows, yet alone stay stable for more than a minute. I wonder what a vidio board must do with all of this? Yep, I'd sure like to see something like this serve a usefull application.